Deep astronomical images, like those used in extragalactic studies seriously suffer from noise in the data. Generally speaking, the sources of noise in an astronomical image are photon counting noise and Instrumental noise which are discussed in detail below. We finish with a short introduction on how random numbers are generated and how you can determine the random number generator and seed value.
|• Photon counting noise:||Poisson noise|
|• Instrumental noise:||Readout, dark current and other sources.|
|• Final noised pixel value:||How the final noised value is calculated.|
|• Generating random numbers:||How random numbers are generated.|